Detachable-blade knife



june 5, i923. )1,458M- H. Bmx

DETACHABLE BLADE KNIFE Filed Jan. 20. 1922 Patented ,lune 5, 1323.

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tattica carica.

HAROLD BRIX, OF CHICAGO, IL XLLINOIS,

DETACHABLE-BLADE KFIFE.

Application tiled January 20, 1922. Serial No. 530,598.

7'0 all whom t may concern:

Be it known that l, HAROLD Bmx, a citizen of the United States, residingat 65 East Lake Street, Chicago, in the county ot' Cook and State ofillinois, have invented a new and useful improvement in Detachable-BladeKnives, of which the following is a specification.

This invention relates to improvements in detachable blade knives, andmore particularly to a device of that character in which the blade ismade of thin sheet-metal, which is more or less flexible; so that thehandle, in which the blade is mounted for use, not only holds the blade,but also reinforces and stifl'ens it to a certain extent.

The invention will be fully understood by reference to the followingrspecitieation and vaccompanying drawing, in which Figure 1 is a view inside elevation of a device embodying the features of my invention,Figure 2 is a top plan view, Figure 3 is a view on an enlarged scalewith one of the blades removed from the handle, Figure l is a Averticalsectional view of the handle, Figure .3 is a view similar to Fig. 1showing the blade in place, and Figure 6 is a view taken as indicated bythe line 6 of Fig. Ll.

As shown in the drawings, the handle of the knife comprises a hand-gripportion l10 having at one end a blade-supporting portion comprising twoparallel prongs 11, separated by a slot 12. The two prongs 11 are joinednear which extends across the slot 12.

Mounted in the part 10 of the handle at the end where the prongs 11join, is a circular spring 1T as shown. This spring 17v is put in placein a hole provided, and a plug 18 is then inserted to hold the spring inplace,

In Fig. 3 is shown one of the blades 50. This blade is made preferablyof thin sheet-metal. Blades from such metal can be easily and cheaplymade; and can ordinarily be stamped out in the shape shown. Such metalis usually more or less flexible. 2t) indicates the cutting edge of theblade. 'lhe upper edge 21 of the blade is provided with a downwardlyyand rearwardly extending notch or eut 22, adapted to accommodate the pin13, when the blade is in place. 'llhe back end of the blade is eonvexlytheir ends by a pin 13,v

curved, as indicated by 23. 1n this curve and at about the center, isprovided a recess or notch 24. The bottom of the rear edge of the bladeis also provided with a depending tongue 26. The forward end of the part10 of the handle, where it meets the rear end of the slot 12, isconcavely curved, as indicated by 30, to correspond with the convexcurve 23 on the rear end of the blade. The spring 17 is so located thatit projects .slightly into the slot 12, as shown.

in operation, the blade is placed in the slot 12 behind the pin 13, andmoved so that the cut or slot 22 embraces the pin 13; so that it will bein position, as indicated by the broken lines in Fig. 5. 'llhe back endof the blade is then pressed downwardly, causing the blade to rotate onthe pin .13, until the notch 24 at the rear of the blade 'snaps over thespring 17. lVhen in this position the convexly curved rear end 23 of theblade will be in contact with the concavely curved part 30 of thehandle, thus preventing further downward movement of the back end` ofthe blade; and the pin 13 will be at the inner end of the cut or notch22. The blade will thus be firmly held in position for use. In removingthe blade, upward pressure on the tongue 26 will release the notch 21from the spring 17, permitting the back end of the blade to be swungupwardly, so that the notch or cut can be removed from the pin 13 andthe blade lifted out.

lt will be noted that the prongs 11 of the handle are considerablythicker than the blade and extend forwardly more than half Iof thelength of the blade. These prongs not only assist in supporting theblade in the handle, but also strengthen and stiti'en it and preventbending of the blade in use. v li'hile I have shown and describedeertain embodiments of my invention, it is to be understood that it iscapable of many modifications. Changes therefore in the construction andarrangement may be made without departing from the spirit and scope ofthe invention as disclosed in the appendedrclaims, in which it is myintention *to claim all novelty inherent in my invention as broadly aspossible in View of the prior art.

' edge of the blade adapted' to embrace the pin joining the ends of theprongs, and a notch at the back end of the blade adapted to engage withspring means in the handle.

2. A thin flexible blade provided with a downwardly and rearwardlyextending slot with parallel sides at its upper edge and having its backend convexly curved and provided with a notch. l

3. ln a device of the character described,

a handle comprising a hand-grip portion and a blade-supporting portion,the blade-supporting portion comprising two parallelly arranged stiffprongs with a slot between adapted to accommodate a thin flexible blade,a in ,joining the prongs near their ends, a thln flexible blade adaptedto fit in the slot between the prongs and provided at its upper edgewitha downwardly and rearwardly extending notch adapted to embrace said pin,and means for yieldingly-pressing the blade forward to retain the pin inthe notch.

4. ln a device of the character described, a handle comprising ahand-grip portion and a blade-supporting portion, the bladesupportingportion comprising two parallelly arranged stii prongs with a slotbetween adapted to accommodate a thin flexible blade. a pin joining theprongs near their ends, a thin flexible blade adapted to it in the slotbetween the prongs and provided at.

its upper edge with a downwardly and rearwardly extending notchadapted-fte embrace said pin, and a notch at the back end of the bladeadapted to engage with spring means in the handle. c

5. lna device of the character described; a handle comprising ahand-'grip portion and a blade-supportlng portion; the bladesupportingportion comprising two parallelly arranged stili' prongs with a slotbetween adapted to accommodate a thin flexible bla-de; a pin joining theprongs near their ends; a thin flexible blade adapted to fit in the slotbetween the prongs and provided at its upper edge with a notch adaptedto embrace said pin; said blade adapted to be placed in position byplacing said notch in engagement with said pin with the back end of saidblade projecting above said prongs, and pivoting the same about said pinas an axis by lowering the back end; and

means for yieldingly retaining said blade in position.

6. In a device of the character described, a handle comprising ahandgrip portion and a blade-supporting portion, the bladesupportingportion comprising two parallelly arranged stiff prongs with aslotbetween adapted to accommodate a thin flexible blade, a thin flexibleblade adapted to be swung into position into saidl slot from the top andbe embraced by said prongs and means for detachably retaining the bladein the slot.

7. In a device of the character described, a handle comprising a4hand-grip portion and a blade-supporting portion, the bladesupportingportion comprising two parallelly arranged stiff prongs with a slot be-4 tween adapted to accommodate a thin flexible blade, and a thinflexible blade adapted to be swung into position into said slot from thetop and `be embraced by said prongs at its upperedge.

8. In a device of the character described, a handle comprising ahand-grip portion and a blade-supporting portion, the blade-supportingportion comprising two parallelly arranged stili' prongs with a slotbetween adapted to accommodate a thin flexible blade, and a thinflexible blade adapted to be swung into position into said slot fromIthe top andbe embraced by said prongs along the major part of its upperedge.

9. In a device of the character described, a handle comprising ahand-grip portion and a blade-supporting portion, the blade supportingportion comprising two parallelly arranged stiff prongs with a slotbetween adapted to accommodate a thin flexible blade, a pin joining theprongs near their ends, a thin flexible blade adapted to be swung intoposition from the top into the slot between the prongs andprovided atits upper edge with a notch adapted to embrace said pin and means fordetachably retaining the blade in the slot between the prongs.

10. In a device of the character described, a handle lcomprising ahand-grip portion and a blade-supporting portion, the bladesupporting-portion comprisingj two parallelly arranged stili prongs witia slot between adapted to accommodat a thin ilexible blade, a pinjoining the prongs near their ends. a thin flexible blade adapted to beswung into position from the top into the slot between the prongs, anotch in the upper edge of the blade adapted to embrace the pin joiningthe ends ot' the prongs, and means at the back end of the blade adaptedto engage with co-acting means in the handle for yieldingly retainingthe blade in position in the slot between the prongs.

HAROLD BRIX.

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